.preview_wrap {}

.preview_img {
    position: relative;
    top: 0;
    left: 0;
    width: 398px;
    height: 398px;
    border: 1px #ccc solid;
}

.preview_img>img {
    width: 100%;
}

.big {
    display: none;
    position: absolute;
    top: 0;
    left: 398px;
    width: 500px;
    height: 500px;
    overflow: hidden;
}

.big img {
    position: absolute;
    top: 0;
    left: 0;
    border: 1px #ccc solid;
}

.mask {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    width: 300px;
    height: 300px;
    background-color: rgb(252, 219, 72);
    opacity: .5;
    cursor: move;
}